This is a rule in the Federal Register. So it's basically like law. It's essentially how the executive is interpreting the laws that congress has passed.

There is a rule that says a new President can automatically overturn all rules made in the last 90 days of the previous administration, but we're before that deadline, so this is pretty much a done deal.

If the next admin wanted to change this, they have to go through the long and arduous rule making process again.